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Debt - Long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 05, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total long-term debt, gross | $ 356,562 |  |
Less – unamortized original issue discount | (5,346) | $ (10,053) |
Less – deferred financing costs |  |  | $ (2,800)
Total debt, net of unamortized discounts | 351,217 | 356,822 |
Current portion of long-term debt, net of unamortized discounts | (14,063) | (10,313) |
Long-term debt, net of unamortized discounts | 337,154 | 346,509 |
2018 Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Less – deferred financing costs | (1,200) |  |
2018 Credit Agreement | 2018 Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt, gross | 126,563 | 136,875 |
Less – deferred financing costs | (1,155) | (1,715) |
Total debt, net of unamortized discounts | 125,408 | 135,160 | $ 150,000
Senior Convertible Notes 2016 |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt, gross | 230,000 | 230,000 |
Less – unamortized original issue discount | (3,021) | (6,004) |
Less – deferred financing costs | (1,170) | (2,334) |
Total debt, net of unamortized discounts | $ 225,809 | $ 221,662 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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